London's Pulse: Medical Officer of Health reports 1848-1972
View report page
Hints from the Health Department. Leaflet from the archive of the Society of Medical Officers of Health. Credit: Wellcome Collection, London
Twickenham 1951
[Report of the Medical Officer of Health for Twickenham]
This page requires JavaScript
Table 8.
Results of the Chemical and Bacteriological Examination of the Water Supply to the Borough of Twickenham for 1951.
Parts per million (unless otherwise stated).
(a) Chemical.
| Description of the Sample | Number of Samples | Ammoniacal Nitrogen | Albuminoid Nitrogen | Oxidised Nitrogen (Nitrate) | Chlorides as Cl | Oxygen abs. from Permanganate 3 hrs. at 80° F. | Turbidity, in terms of Silica | Colour, m.m. brown, 2 ft. tube. Burgess's Tintometer | Hardness (total) | Hardness (Non-carb.) | pH. Value | Phosphate as P.O. 111/4 | Silica as SlO2 | Conductivity |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| River Thames water filtered at Hampton Works | 250 | 0.019 | 0.085 | 4.1 | 22.0 | 1.21 | 0.3 | 15 | 268 | 63 | 7.9 | 0.32 | 11.0 | 450 |
(b) Bacteriological.
| Description of the Sample | Number of Samples | Plate count (average per millilitre) Colonies counted on agar after 20-24 hrs. at 37°C. | Bact. coli test | |
|---|---|---|---|---|
| Percentage of samples negative in 100 ml. | Average number of Bact. coli per 100 ml. | |||
| River Thames water filtered at Hampton Works | 766 | 19.0 | 100.0 | Nil |